1. Datalys Center for Sports Injury Research and Prevention, Indianapolis, IN
2. Athletic Training Program, Department of Interdisciplinary Health Sciences, Arizona School of Health Sciences, A.T. Still University, Mesa
3. Department of Exercise and Sport Science, Colorado School of Public Health, University of Colorado Anschutz, Aurora
4. Injury Prevention Research Center, Colorado School of Public Health, University of Colorado Anschutz, Aurora
5. Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz, Aurora
6. Palo Alto Medical Foundation Research Institute, CA
7. Lebanon Valley College, Annville, PA
8. Department of Pediatrics, University of Colorado School of Medicine, Aurora
9. Department of Epidemiology, University of North Carolina at Chapel Hill